Common Stock Options And Stock Purchase Plan (Schedule Of Stock Options Activity) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Exercised, Number of Shares		0	0
Employee Stock Option [Member]
Beginning balance, Number of Shares		50,000	61,980
Granted, Number of Shares		0	0
Exercised, Number of Shares		0	0
Canceled/forfeited/expired, Number of Shares		0	11,980
Ending balance, Number of Shares		50,000	50,000	61,980
Beginning balance, Weighted-Average Exercise Price		$ 4.21	$ 4.20
Canceled/forfeited/expired, Weighted-Average Exercise Price			4.16
Ending balance, Weighted-Average Exercise Price		$ 4.21	$ 4.21	$ 4.20
Balance, Weighted-Average Remaining Contractual Term		7 years 7 months 6 days	8 years 7 months 6 days	9 years 8 months 12 days
Vested and exercisable, Aggregate Intrinsic Value	[1]	$ 0
Number of shares vested		50,000
Director Stock Option [Member]
Beginning balance, Number of Shares		207,500	185,000
Granted, Number of Shares		0	25,000
Exercised, Number of Shares		0	0
Canceled/forfeited/expired, Number of Shares		0	2,500
Ending balance, Number of Shares		207,500	207,500	185,000
Beginning balance, Weighted-Average Exercise Price		$ 4.62	$ 4.64
Granted, Weighted-Average Exercise Price			4.39
Canceled/forfeited/expired, Weighted-Average Exercise Price			4.15
Ending balance, Weighted-Average Exercise Price		$ 4.62	$ 4.62	$ 4.64
Balance, Weighted-Average Remaining Contractual Term		7 years 4 months 24 days	8 years 4 months 24 days	9 years 6 months
Sharebased Compensation Arrangement by Sharebased Payment Award Option Granted Weighted Average Remaining Contractual Term			10 years
Vested and exercisable, Aggregate Intrinsic Value	[1]	$ 0
Number of shares vested		122,500

[1] The aggregate intrinsic value is calculated as approximately the difference between the weighted average exercise price of the underlying awards and the Company's estimated current fair market value at December 31, 2015.